Aresearcher would like to determine the effect of caffeine on memory. participants are randomly assigned to receive a caffeine pill or a sugar pill. both groups complete a recall task that assesses their memory. however, even those who received the sugar pill had a small increase in memory. this is likely due to:
a. the experimental effect
b. the correlational approach to the study
c. the placebo effect
d. the participants becoming smarter

John lennon and paul mccartney belonged to this group

In the modern world, many countries with kings or queens have evolved into constitutional democracies. in these countries, monarchs are mostly

Which is the best conclusion that can be drawn regarding the status of african-americans in the south in the late 1800s? a) african-americans made tremendous political, social, and economic advancements during the reconstruction era. b) passage of the 13th, 14th, and 15th amendments to the u.s. constitution guaranteed equal status and rights for all african-americans. c) the reconstruction policies enacted by the federal government were highly effective in african-american citizens transition to life after slavery. d) although african-americans had equal rights under federal law they were still economically, politically, and socially inferior to whites in the south during the reconstruction era.